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Date:   Wed, 8 Aug 2018 11:13:54 +0200
From:   Joerg Roedel <>
To:     Kenneth Lee <>
Cc:     Jonathan Corbet <>,
        Herbert Xu <>,
        "David S . Miller" <>,
        Alex Williamson <>,
        Kenneth Lee <>,
        Hao Fang <>,
        Zhou Wang <>,
        Zaibo Xu <>,
        Philippe Ombredanne <>,
        Greg Kroah-Hartman <>,
        Thomas Gleixner <>,,,,,,,
        Lu Baolu <>,
        Sanjay Kumar <>,
Subject: Re: [RFC PATCH 2/7] iommu: Add share domain interface in iommu for

On Wed, Aug 01, 2018 at 06:22:16PM +0800, Kenneth Lee wrote:
> From: Kenneth Lee <>
> This patch add sharing interface for a iommu_group. The new interface:
> 	iommu_group_share_domain()
> 	iommu_group_unshare_domain()
> can be used by some virtual iommu_group (such as iommu_group for spimdev)
> to share their parent's iommu_group.
> When the domain of the group is shared, it cannot be changed before
> unshared.  In the future, notification can be added if update is required.

>From the description or the patch I don't really get why this is needed.
Please update the description and make a case for this API addition.


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